In any event, Bruce stays up nights thinking about contingencies for no one else more than the most dangerous person on Earth.
This is an interesting one, and part of the problem with the Babel arc. Diana has no kryptonite. J'onn? Fire. Clark? Green K or a magic bullet borrowed from Zatanna. A GL? Get the ring off, or make some kind of mental or telepathic attack. Captain Marvel? Catch him when he's Billy and stick a gag in his mouth. But what the hell do you do to Diana? She simply doesn't have a weakness that a normal human can exploit - at least, not a white hat normal human. The "pride" thing from Babel doesn't stand up to even brief scrutiny, and doesn't help anyway against, say, Starro, or Deadman-syle possession; but what could Waid have come up with instead? What contingency could you possibly make for a rogue Diana, apart from "call Superman"?